package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_TYPE_KEY;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result queryShopTypeList() {
        //1.从redis中查询商铺缓存
        String shopTypeJson = stringRedisTemplate.opsForValue().get(CACHE_SHOP_TYPE_KEY);
        //判断redis中是否存在数据
        if (StrUtil.isNotBlank(shopTypeJson)){
            //存在，直接返回
            List<ShopType> shopTypes = JSONUtil.toList(shopTypeJson, ShopType.class);
            return Result.ok(shopTypes);
        }
        //redis中不存在，查询数据库
        List<ShopType> shopTypes = query().orderByAsc("sort").list();
        //判断数据库中是否存在商户数据
        if(shopTypes==null){
            //不存在，返回错误信息
            return Result.fail("商铺类型数据为空");
        }
        //存在，存入redis
        stringRedisTemplate.opsForValue().set(CACHE_SHOP_TYPE_KEY,JSONUtil.toJsonStr(shopTypes));
        //返回
        return Result.ok(shopTypes);
    }
}
